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	<title>YUI Library Examples: TreeView Control: Custom TreeView with Check Boxes</title>
    

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	<div id="pagetitle"><h1>YUI Library Examples: TreeView Control: Custom TreeView with Check Boxes</h1></div>
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	<h1>TreeView Control: Custom TreeView with Check Boxes</h1>
	
	<div class="exampleIntro">
	<p>The TaskNode example implements a task list using treeview.  It does so by extending the TextNode class to have additional, specific functionality.  In this example, each TaskNode has three potential states: Checked, partially-checked (not all subtasks complete), and unchecked.  Checking off a task automatically checks off all subtasks.</p>			
	</div>	
					
	<div class="example-container module ">
			<div id="example-canvas" class="bd">
	
		
	<!--BEGIN SOURCE CODE FOR EXAMPLE =============================== -->
	
	<!-- Some style for the expand/contract section-->
<style>
#expandcontractdiv {border:1px solid #336600; background-color:#FFFFCC; margin:0 0 .5em 0; padding:0.2em;}
#treeDiv1 { background: #fff }
</style>

<!-- markup for expand/contract links -->
<div id="expandcontractdiv">
	<a id="expand" href="#">Expand all</a>
	<a id="collapse" href="#">Collapse all</a>
	<a id="check" href="#">Check all</a>
	<a id="uncheck" href="#">Uncheck all</a>
	<a id="getchecked" href="#">Log array of checked nodes</a>
</div>
<div id="treeDiv1"></div>

<script type="text/javascript" src="assets/js/TaskNode.js"></script>

<script type="text/javascript">
(function() {
	var tree;
	var nodes = [];
	var nodeIndex;
	
	function treeInit() {
		YAHOO.log("Initializing TaskNode TreeView instance.")
		buildRandomTaskNodeTree();
	}
	
	//handler for expanding all nodes
	YAHOO.util.Event.on("expand", "click", function(e) {
		YAHOO.log("Expanding all TreeView  nodes.", "info", "example");
		tree.expandAll();
		YAHOO.util.Event.preventDefault(e);
	});
	
	//handler for collapsing all nodes
	YAHOO.util.Event.on("collapse", "click", function(e) {
		YAHOO.log("Collapsing all TreeView  nodes.", "info", "example");
		tree.collapseAll();
		YAHOO.util.Event.preventDefault(e);
	});

	//handler for checking all nodes
	YAHOO.util.Event.on("check", "click", function(e) {
		YAHOO.log("Checking all TreeView  nodes.", "info", "example");
		checkAll();
		YAHOO.util.Event.preventDefault(e);
	});
	
	//handler for unchecking all nodes
	YAHOO.util.Event.on("uncheck", "click", function(e) {
		YAHOO.log("Unchecking all TreeView  nodes.", "info", "example");
		uncheckAll();
		YAHOO.util.Event.preventDefault(e);
	});


	YAHOO.util.Event.on("getchecked", "click", function(e) {
		YAHOO.log("Checked nodes: " + YAHOO.lang.dump(getCheckedNodes()), "info", "example");
            
		YAHOO.util.Event.preventDefault(e);
	});

	//Function  creates the tree and 
	//builds between 3 and 7 children of the root node:
    function buildRandomTaskNodeTree() {
	
		//instantiate the tree:
        tree = new YAHOO.widget.TreeView("treeDiv1");

        for (var i = 0; i < Math.floor((Math.random()*4) + 3); i++) {
            var tmpNode = new YAHOO.widget.TaskNode("label-" + i, tree.getRoot(), false);
            // tmpNode.collapse();
            // tmpNode.expand();
            buildRandomTaskBranch(tmpNode);
        }

       // Expand and collapse happen prior to the actual expand/collapse,
       // and can be used to cancel the operation
       tree.subscribe("expand", function(node) {
              YAHOO.log(node.index + " was expanded", "info", "example");
              // return false; // return false to cancel the expand
           });

       tree.subscribe("collapse", function(node) {
              YAHOO.log(node.index + " was collapsed", "info", "example");
           });

       // Trees with TextNodes will fire an event for when the label is clicked:
       tree.subscribe("labelClick", function(node) {
              YAHOO.log(node.index + " label was clicked", "info", "example");
           });

       // Trees with TaskNodes will fire an event for when a check box is clicked
       tree.subscribe("checkClick", function(node) {
              YAHOO.log(node.index + " check was clicked", "info", "example");
           });

       tree.subscribe("clickEvent", function(node) {
              YAHOO.log(node.index + " clickEvent", "info", "example");
           });

		//The tree is not created in the DOM until this method is called:
        tree.draw();
    }

	var callback = null;

	function buildRandomTaskBranch(node) {
		if (node.depth < 5) {
			YAHOO.log("buildRandomTextBranch: " + node.index);
			for ( var i = 0; i < Math.floor(Math.random() * 4) ; i++ ) {
				var tmpNode = new YAHOO.widget.TaskNode(node.label + "-" + i, node, false);
                //tmpNode.onCheckClick = onCheckClick;
				buildRandomTaskBranch(tmpNode);
			}
		}
	}

    function onCheckClick(node) {
        YAHOO.log(node.label + " check was clicked, new state: " + 
                node.checkState, "info", "example");
    }

    function checkAll() {
        var topNodes = tree.getRoot().children;
        for(var i=0; i<topNodes.length; ++i) {
            topNodes[i].check();
        }
    }

    function uncheckAll() {
        var topNodes = tree.getRoot().children;
        for(var i=0; i<topNodes.length; ++i) {
            topNodes[i].uncheck();
        }
    }

   // Gets the labels of all of the fully checked nodes
   // Could be updated to only return checked leaf nodes by evaluating
   // the children collection first.
    function getCheckedNodes(nodes) {
        nodes = nodes || tree.getRoot().children;
        checkedNodes = [];
        for(var i=0, l=nodes.length; i<l; i=i+1) {
            var n = nodes[i];
            //if (n.checkState > 0) { // if we were interested in the nodes that have some but not all children checked
            if (n.checkState === 2) {
                checkedNodes.push(n.label); // just using label for simplicity
            }

            if (n.hasChildren()) {
checkedNodes = checkedNodes.concat(getCheckedNodes(n.children));
            }
        }

        return checkedNodes;
    }


	YAHOO.util.Event.onDOMReady(treeInit);
})();
</script>
	
	<!--END SOURCE CODE FOR EXAMPLE =============================== -->
	
		
		</div>
		
	
	</div>			
	</div>
		
	<h2 class="first">The TaskNode Subclass</h2>

<p>This example explores the extension of TreeView via a subclass of the TextNode class.  The full source of the TaskNode subclass follows:</p>


<textarea name="code" class="JScript" cols="60" rows="1">/**
 * The check box marks a task complete.  It is a simulated form field 
 * with three states ...
 * 0=unchecked, 1=some children checked, 2=all children checked
 * When a task is clicked, the state of the nodes and parent and children
 * are updated, and this behavior cascades.
 *
 * @extends YAHOO.widget.TextNode
 * @constructor
 * @param oData    {object}  A string or object containing the data that will
 *                           be used to render this node.
 * @param oParent  {Node}    This node's parent node
 * @param expanded {boolean} The initial expanded/collapsed state
 * @param checked  {boolean} The initial checked/unchecked state
 */
YAHOO.widget.TaskNode = function(oData, oParent, expanded, checked) {
	YAHOO.widget.TaskNode.superclass.constructor.call(this,oData,oParent,expanded);
    this.setUpCheck(checked || oData.checked);

};

YAHOO.extend(YAHOO.widget.TaskNode, YAHOO.widget.TextNode, {

    /**
     * True if checkstate is 1 (some children checked) or 2 (all children checked),
     * false if 0.
     * @type boolean
     */
    checked: false,

    /**
     * checkState
     * 0=unchecked, 1=some children checked, 2=all children checked
     * @type int
     */
    checkState: 0,

	/**
     * The node type
     * @property _type
     * @private
     * @type string
     * @default "TextNode"
     */
    _type: "TaskNode",
	
	taskNodeParentChange: function() {
        //this.updateParent();
    },
	
    setUpCheck: function(checked) {
        // if this node is checked by default, run the check code to update
        // the parent's display state
        if (checked && checked === true) {
            this.check();
        // otherwise the parent needs to be updated only if its checkstate 
        // needs to change from fully selected to partially selected
        } else if (this.parent && 2 === this.parent.checkState) {
             this.updateParent();
        }

        // set up the custom event on the tree for checkClick
        /**
         * Custom event that is fired when the check box is clicked.  The
         * custom event is defined on the tree instance, so there is a single
         * event that handles all nodes in the tree.  The node clicked is 
         * provided as an argument.  Note, your custom node implentation can
         * implement its own node specific events this way.
         *
         * @event checkClick
         * @for YAHOO.widget.TreeView
         * @param {YAHOO.widget.Node} node the node clicked
         */
        if (this.tree && !this.tree.hasEvent("checkClick")) {
            this.tree.createEvent("checkClick", this.tree);
        }

		this.tree.subscribe('clickEvent',this.checkClick);
        this.subscribe("parentChange", this.taskNodeParentChange);


    },

    /**
     * The id of the check element
     * @for YAHOO.widget.TaskNode
     * @type string
     */
    getCheckElId: function() { 
        return "ygtvcheck" + this.index; 
    },

    /**
     * Returns the check box element
     * @return the check html element (img)
     */
    getCheckEl: function() { 
        return document.getElementById(this.getCheckElId()); 
    },

    /**
     * The style of the check element, derived from its current state
     * @return {string} the css style for the current check state
     */
    getCheckStyle: function() { 
        return "ygtvcheck" + this.checkState;
    },


   /**
     * Invoked when the user clicks the check box
     */
    checkClick: function(oArgs) { 
		var node = oArgs.node;
		var target = YAHOO.util.Event.getTarget(oArgs.event);
		if (YAHOO.util.Dom.hasClass(target,'ygtvspacer')) {
	        node.logger.log("previous checkstate: " + node.checkState);
	        if (node.checkState === 0) {
	            node.check();
	        } else {
	            node.uncheck();
	        }

	        node.onCheckClick(node);
	        this.fireEvent("checkClick", node);
		    return false;
		}
    },

    /**
     * Override to get the check click event
     */
    onCheckClick: function() { 
        this.logger.log("onCheckClick: " + this);
    },

    /**
     * Refresh the state of this node's parent, and cascade up.
     */
    updateParent: function() { 
        var p = this.parent;

        if (!p || !p.updateParent) {
            this.logger.log("Abort udpate parent: " + this.index);
            return;
        }

        var somethingChecked = false;
        var somethingNotChecked = false;

        for (var i=0, l=p.children.length;i<l;i=i+1) {

            var n = p.children[i];

            if ("checked" in n) {
                if (n.checked) {
                    somethingChecked = true;
                    // checkState will be 1 if the child node has unchecked children
                    if (n.checkState === 1) {
                        somethingNotChecked = true;
                    }
                } else {
                    somethingNotChecked = true;
                }
            }
        }

        if (somethingChecked) {
            p.setCheckState( (somethingNotChecked) ? 1 : 2 );
        } else {
            p.setCheckState(0);
        }

        p.updateCheckHtml();
        p.updateParent();
    },

    /**
     * If the node has been rendered, update the html to reflect the current
     * state of the node.
     */
    updateCheckHtml: function() { 
        if (this.parent && this.parent.childrenRendered) {
            this.getCheckEl().className = this.getCheckStyle();
        }
    },

    /**
     * Updates the state.  The checked property is true if the state is 1 or 2
     * 
     * @param the new check state
     */
    setCheckState: function(state) { 
        this.checkState = state;
        this.checked = (state > 0);
    },

    /**
     * Check this node
     */
    check: function() { 
        this.logger.log("check");
        this.setCheckState(2);
        for (var i=0, l=this.children.length; i<l; i=i+1) {
            var c = this.children[i];
            if (c.check) {
                c.check();
            }
        }
        this.updateCheckHtml();
        this.updateParent();
    },

    /**
     * Uncheck this node
     */
    uncheck: function() { 
        this.setCheckState(0);
        for (var i=0, l=this.children.length; i<l; i=i+1) {
            var c = this.children[i];
            if (c.uncheck) {
                c.uncheck();
            }
        }
        this.updateCheckHtml();
        this.updateParent();
    },
    // Overrides YAHOO.widget.TextNode

    getContentHtml: function() {                                                                                                                                           
        var sb = [];                                                                                                                                                       
        sb[sb.length] = '<td';                                                                                                                                             
        sb[sb.length] = ' id="' + this.getCheckElId() + '"';                                                                                                               
        sb[sb.length] = ' class="' + this.getCheckStyle() + '"';                                                                                                           
        sb[sb.length] = '>';                                                                                                                                               
        sb[sb.length] = '<div class="ygtvspacer"></div></td>';                                                                                                             
                                                                                                                                                                           
        sb[sb.length] = '<td><span';                                                                                                                                       
        sb[sb.length] = ' id="' + this.labelElId + '"';                                                                                                                    
        if (this.title) {                                                                                                                                                  
            sb[sb.length] = ' title="' + this.title + '"';                                                                                                                 
        }                                                                                                                                                                  
        sb[sb.length] = ' class="' + this.labelStyle  + '"';                                                                                                               
        sb[sb.length] = ' >';                                                                                                                                              
        sb[sb.length] = this.label;                                                                                                                                        
        sb[sb.length] = '</span></td>';                                                                                                                                    
        return sb.join("");                                                                                                                                                
    }  
});</textarea>

<h2>Configuration for This Example</h2>

<p>You can load the necessary JavaScript and CSS for this example from Yahoo's servers.  <a href="http://developer.yahoo.com/yui/articles/hosting/?treeview&MIN#configure">Click here to load the YUI Dependency Configurator with all of this example's dependencies preconfigured</a>.</p>

				</div>
				<div class="yui-u">
						<div id="loggerModule" class="yui-skin-sam">
						<h3 class="firstContent">YUI Logger Output:</h3>
								<div id="loggerDiv"></div>
						</div>
					
				
					<div id="examples">
						<h3>TreeView Control Examples:</h3>
	
						<div id="exampleToc">
							<ul>
								<li><a href='../treeview/default_tree.html'>Default TreeView</a></li><li><a href='../treeview/dynamic_tree.html'>Dynamically Loading Node Data</a></li><li><a href='../treeview/folder_style.html'>Folder-Style TreeView Design</a></li><li><a href='../treeview/menu_style.html'>Menu-Style TreeView Design</a></li><li><a href='../treeview/customicons.html'>Using TreeView with Custom Icons</a></li><li class='selected'><a href='../treeview/tasklist.html'>Custom TreeView with Check Boxes</a></li><li><a href='../treeview/tv_tooltip.html'>TreeView with Tooltips</a></li><li><a href='../treeview/tv-markup.html'>Three Ways to Define a TreeView: Markup (Progressive Enhancement), Existing TreeView Instance, and Object Literal </a></li><li><a href='../treeview/tv-edit.html'>Inline Editing of TreeView Node Labels</a></li><li><a href='../menu/treeviewcontextmenu.html'>Adding A Context Menu To A TreeView (included with examples for Menu Family)</a></li>							</ul>
						</div>
					</div>
					
					<div id="module">
						<h3>More TreeView Control Resources:</h3>
						<ul>
							<li><a href="http://developer.yahoo.com/yui/treeview/">User's Guide</a> (external)</li>
						<li><a href="../../docs/module_treeview.html">API Documentation</a></li>
                            
                            
							<li><a href="http://yuiblog.com/assets/pdf/cheatsheets/treeview.pdf">Cheat Sheet PDF</a> (external)</li></ul>
					</div>
			  </div>
		</div>
		
		</div>
	</div>


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Drop Utility - Functional Examples" href="../../examples/dragdrop/index.html">Drag &amp; Drop</a></li><li class="item"><a title="The YUI Event Utility - Functional Examples" href="../../examples/event/index.html">Event</a></li><li class="item"><a title="The YUI Get Utility - Functional Examples" href="../../examples/get/index.html">Get</a></li><li class="item"><a title="The YUI ImageCropper Control - Functional Examples" href="../../examples/imagecropper/index.html">ImageCropper</a></li><li class="item"><a title="The YUI ImageLoader Utility - Functional Examples" href="../../examples/imageloader/index.html">ImageLoader</a></li><li class="item"><a title="The YUI JSON Utility - Functional Examples" href="../../examples/json/index.html">JSON</a></li><li class="item"><a title="The YUI Layout Manager - Functional Examples" href="../../examples/layout/index.html">Layout Manager</a></li><li class="item"><a title="The YUI Logger Control - Functional Examples" href="../../examples/logger/index.html">Logger</a></li><li class="item"><a title="The YUI Menu Control - Functional Examples" href="../../examples/menu/index.html">Menu</a></li><li class="item"><a title="The YUI Paginator - Functional Examples" href="../../examples/paginator/index.html">Paginator</a></li><li class="item"><a title="The YUI Profiler Utility - Functional Examples" href="../../examples/profiler/index.html">Profiler</a></li><li class="item"><a title="The YUI ProfileViewer Control - Functional Examples" href="../../examples/profilerviewer/index.html">ProfilerViewer</a></li><li class="item"><a title="The YUI Resize Utility - Functional Examples" href="../../examples/resize/index.html">Resize</a></li><li class="item"><a title="The YUI Rich Text Editor - Functional Examples" href="../../examples/editor/index.html">Rich Text Editor</a></li><li class="item"><a title="The YUI Selector Utility - Functional Examples" href="../../examples/selector/index.html">Selector</a></li><li class="item"><a title="The YUI Slider Control - Functional Examples" href="../../examples/slider/index.html">Slider</a></li><li class="item"><a title="The YUI Stylesheet Utility - Functional Examples" href="../../examples/stylesheet/index.html">Stylesheet</a></li><li class="item"><a title="The YUI TabView Control - Functional Examples" href="../../examples/tabview/index.html">TabView</a></li><li class="selected "><a title="The YUI TreeView Control - Functional Examples" href="../../examples/treeview/index.html">TreeView</a></li><li class="item"><a title="The YUI Uploader Utility - Functional Examples" href="../../examples/uploader/index.html">Uploader (experimental)</a></li><li class="item"><a title="The YUI YAHOO Global Object - Functional Examples" href="../../examples/yahoo/index.html">YAHOO Global Object</a></li><li class="item"><a title="The YUI Loader Utility - Functional Examples" href="../../examples/yuiloader/index.html">YUI Loader</a></li><li class="item"><a title="The YUI Test Utility - Functional Examples" href="../../examples/yuitest/index.html">YUI Test</a></li><li class="item"><a title="YUI Reset CSS - Functional Examples" href="../../examples/reset/index.html">Reset CSS</a></li><li class="item"><a title="YUI Base CSS - Functional Examples" href="../../examples/base/index.html">Base CSS</a></li><li class="item"><a title="YUI Fonts CSS - Functional Examples" href="../../examples/fonts/index.html">Fonts CSS</a></li><li class="item"><a title="YUI Grids CSS - Functional Examples" href="../../examples/grids/index.html">Grids CSS</a></li><li class="sect">YUI Articles on the YUI Website</li><li class="item"><a title="Answers to Frequently Asked Questions about the YUI Library" href="http://developer.yahoo.com/yui/articles/faq/">YUI FAQ (external)</a></li><li class="item"><a title="Yahoo!'s philosophy of Graded Browser Support" href="http://developer.yahoo.com/yui/articles/gbs/">Graded Browser Support (external)</a></li><li class="item"><a title="Reporting Bugs and Making Feature Requests for YUI Components" href="http://developer.yahoo.com/yui/articles/reportingbugs/">Bug Reports/Feature Requests (external)</a></li><li class="item"><a title="Serve YUI source files from Yahoo! -- free, fast, and simple" href="http://developer.yahoo.com/yui/articles/hosting/">Serving YUI Files from Yahoo! (external)</a></li><li class="item"><a title="Best practices for working with web services while protecting user privacy" href="http://developer.yahoo.com/security/">Security Best Practices (external)</a></li></ul>
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